package com.hurl.waguji.base;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

public class CharacterEncodingFilter implements Filter{
    protected String encoding = null;
    protected FilterConfig filterConfig = null;
    protected boolean ignore = true;

    public void init(FilterConfig filterConfig) throws ServletException {
        this.filterConfig=filterConfig;
        this.encoding=filterConfig.getInitParameter("encoding");
        String value=filterConfig.getInitParameter("ignore");
        if(value==null)
        this.ignore=true;
        else if(value.equalsIgnoreCase("true"))
            this.ignore=true;
        else
            this.ignore=false;
    }

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        if (ignore || (request.getCharacterEncoding() == null)) {
            String encoding = selectEncoding(request);
            if (encoding != null){
                request.setCharacterEncoding(encoding);
            }else
                System.out.println("encoding has not set");
        }
        chain.doFilter(request, response);
    }

    public void destroy() {
        this.encoding = null;
        this.filterConfig = null;
    }

    protected String selectEncoding(ServletRequest request) {
        return (this.encoding);
    }
}
